Sabtu, 10 Desember 2011


1.      An ebonite will be negatively charge if it is rubbed on wool, because ….
a.       Positive charges move from ebonite to wool
b.      Positive charges move from wool to ebonite
c.       Electron moves from wool to ebonite
d.      Electron moves from ebonite to wool
2.      A body has a charge Q of +8C, it is mean .....
a.   The body is in excess of electrons of 8C
b.   The body is in excess of neutrons of 8C
c.   The body lacks electrons of 8C
d.   The body lacks protons of 8C
3.      In electrostatic experiments, protons cannot be gained or lost from an atom because they are ….
a. Tightly bound within orbital     
b.Tightly bound in the nucleus    
c. Positively charged
d.      Negatively charged
4.      If object A attract object B, object B attract object C, and object C repel object D which negatively charged, so the charge of object A, B, and C is ….
a.       A positive, B positive, C positive
b.      A positive, B negative, C positive
c.       A negative, B negative, C positive
d.      A negative, B positive, C negative
5.      Notice these experiments:
ü  Object A : plastic is rubbed on the wool
ü  Object B : glass rod is rubbed on the silk
The true statement is .....
a.   Object B will be negatively charged  
b.   Object A will be positively charged
c.   A and B will attract each other          
d.   A and B will repell each other
6.      If two similar electric charges are brought close to each other at a certain distance, they will produce repulsive force of F. If the distance of those two charges is chaged  four times larger, and the second charge is two times larger, the repulsive force becomes .....
a.   1/2 F                                                      
b.   1/4 F
c.   4 F                                                      
d.   8 F
 7.      A body is positively charged by 3.6 x 10-2C. The electric field strength at a distance of 20 cm is ….
a.   8.1 x 109 N/C                                     
b.   8.1 x 1010 N/C                                    
      c.   81 x 1010 N/C
      d.   81 x 1011 N/C
 8.  Specification of electric soldering is 220 volt/60 watt. Then it is set on the voltage source of 110 volt. What is the power of its electric soldering?
a.   15 watt
b.   20 watt
c.   35 watt
d.   40 watt
9.  Poles from dry cell made from ….
a.   The carbon as a positive pole and the copper as a negative pole
b.   The copper as a positive pole and the zinc as a negative pole
c.   The carbon as a positive pole and the zinc as a negative pole
d.   The zinc as a positive pole and the carbon as a negative pole
10.  A television uses 3 A current on 220 V voltages. It is on for 2 hours. The energy used is ….
a.   6 Wh
b.   440 Wh
c.   660 Wh
d.   1320 Wh
11.  Four batteries have an EMF of 1.5 volt and internal resistance of 0.8 Ω each. Those batteries are connected in series and they are connected to a light bulb with a resistance of 2.8 Ω. The current flowing through the light bulb is ….
a.       1.0 A
b.      2.5 A
c.       4 A
d.      5 A
12.  An electric stove is connected to a 12 volt battery. If the heating element has an internal resistance of 12 Ω, then the amount of heat produced by the stove for 10 minutes is ….
a.   1,800 J
b.   3,600 J
c.   7,200 J
d.   14,400 J
13.  Rubidium has valence electron of 1 {2, 8, 18, 8, 1}. From its electron configuration, we know that Rubidium is placed in ….
a.   Period 5 and Group of I A
b.   Period 1 and Group of VI A
c.   Period 5 and Group of VII A
d.   Period 1 and Group of VII A
14.  Magnesium has the number atom of 12, so the electron valence of Magnesium is ….
a.   1
b.   2
c.   3
d.   4
15.  Below are the elements in the halogen group, except ….
a.       Fluorine
b.      Bromine
c.       Iodine
d.   Boron

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